using System;
using System.Windows.Forms;
using FBroSharp;
using FBroSharp.Lib;
using FBroSharp.Event;
using FBroSharp.DataType;
using FBroSharp.Value;
using FBroSharp.Const;

namespace 电商价格监控器
{
    /// <summary>
    /// Browser event handler - MANDATORY for browser creation
    /// </summary>
    public class BrowserEvent : FBroSharpBrowserEvent
    {
        private Form1 _form;

        public BrowserEvent(Form1 form)
        {
            _form = form;
        }

        /// <summary>
        /// ⚠️ REQUIRED: Browser created (TWO parameters!)
        /// </summary>
        public override void OnAfterCreated(IFBroSharpBrowser browser, IFBroSharpDictionaryValue extrainfo)
        {
            _form.OnBrowserCreated(browser);
        }

        /// <summary>
        /// ⚠️ CRITICAL FOR SINGLE-WINDOW APPS: Popup control - Prevent new windows
        /// </summary>
        public override bool OnBeforePopup(
            IFBroSharpBrowser browser, 
            IFBroSharpFrame frame, 
            string target_url, 
            string target_frame_name,
            FBroSharpWindowOpenDisposition target_disposition, 
            bool user_gesture, 
            FBroSharpPopupfeatures popupFeatures, 
            ref FBroSharpWindowsInfo windowInfo,
            ref FBroSharpBrowserSetting settings,
            ref bool no_javascript_access, 
            IFBroSharpUseExtraData user_settings)
        {
            // Open in current window instead of new window
            frame.LoadURL(target_url);
            return true;  // true = block popup, false = allow popup
        }

        /// <summary>
        /// ⚠️ REQUIRED: Address changed
        /// </summary>
        public override void OnAddressChange(IFBroSharpBrowser browser, IFBroSharpFrame frame, string url)
        {
            if (frame.IsMain())
            {
                _form.UpdateAddressBar(url);
            }
        }

        /// <summary>
        /// ⚠️ REQUIRED: Title changed
        /// </summary>
        public override void OnTitleChange(IFBroSharpBrowser browser, string title)
        {
            _form.UpdateTitle(title);
        }

        /// <summary>
        /// ⚠️ REQUIRED: Loading state changed
        /// </summary>
        public override void OnLoadingStateChange(IFBroSharpBrowser browser, bool isLoading, bool canGoBack, bool canGoForward)
        {
            _form.UpdateLoadingState(isLoading, canGoBack, canGoForward);
        }

        /// <summary>
        /// ⚠️ REQUIRED: Page load completed
        /// </summary>
        public override void OnLoadEnd(IFBroSharpBrowser browser, IFBroSharpFrame frame, int httpStatusCode)
        {
            if (frame.IsMain())
            {
                _form.UpdateStatus($"加载完成 (HTTP {httpStatusCode})");
            }
        }

        /// <summary>
        /// ⚠️ REQUIRED: Page load error (errorCode is int!)
        /// </summary>
        public override void OnLoadError(IFBroSharpBrowser browser, IFBroSharpFrame frame, 
            int errorCode, string errorText, string failedUrl)
        {
            if (frame.IsMain())
            {
                _form.UpdateStatus($"加载失败: {errorText}");
            }
        }

        /// <summary>
        /// ⚠️ REQUIRED: Before browser close
        /// </summary>
        public override void OnBeforeClose(IFBroSharpBrowser browser)
        {
            // Cleanup
        }

        /// <summary>
        /// ⚠️ REQUIRED: Can browser close
        /// </summary>
        public override bool DoClose(IFBroSharpBrowser browser)
        {
            return false; // false = allow close
        }
    }
}


